How Does the Fuel Cost Calculator Work?
The fuel cost calculator uses a straightforward formula: it divides your monthly driving distance by your vehicle's fuel efficiency to determine how much fuel you consume, then multiplies that by the current fuel price. For example, driving 1,200 km/month with a mileage of 15 km/l at ₹108/litre results in 80 litres consumed, costing ₹8,640 per month.
Petrol vs Diesel vs CNG vs Electric — Cost Comparison
Fuel type significantly impacts your running costs. In India, a petrol car typically costs ₹5–8 per km, while diesel drops to ₹4–6 per km due to better efficiency. CNG is the cheapest at ₹2.5–4 per km, though it requires CNG stations nearby. Electric vehicles cost just ₹1–1.5 per km if charged at home, making them the most economical option long-term despite higher upfront costs.
Understanding CO₂ Emissions from Fuel
Every litre of petrol burned produces approximately 2.31 kg of CO₂, while diesel emits about 2.68 kg per litre. Our fuel economy calculator tracks these emissions so you can see your environmental impact alongside costs. Switching from a petrol car to CNG can reduce CO₂ by 20–25%, and moving to an EV (depending on your grid's energy mix) can cut it by 50–90%.
Tips to Reduce Your Fuel Costs
Beyond improving mileage, you can lower costs by refuelling during early morning when fuel is denser, using loyalty programmes at fuel stations, maintaining correct tyre pressure, and planning routes to avoid heavy traffic. For daily commuters, carpooling can cut individual fuel costs by 50% or more.
Don't know your vehicle's exact mileage? Use our Mileage Calculator to find your real-world km/l before estimating costs.